UW- value ≤ 1.4
Cortizo COR 70 Hoja Oculta is the favorite choice of modern architects and designers. The revolutionary "Hidden Sash" technology (Hoja Oculta) means that from the outside you see only a thin frame of just 66 mm, while the sash is completely hidden behind it. This provides maximum glazing area and a sleek, contemporary, minimalist aesthetic.
Despite being aluminum, thanks to a powerful 35 mm thermal break (RPT - Ruptura de Puente Térmico), this window achieves thermal insulation comparable to the best PVC systems. The combination of aluminum's inherent strength with advanced thermal engineering makes it ideal for new construction and designer renovations where clean lines and maximum light are paramount.
Article number
300.200.001
Technical Specifications
Details
A favorite of modern architects. "Hidden Sash" technology means only a thin 66mm frame is visible from outside - maximum glazing, minimalist look.
Material
Aluminum
Profile depth
70mm
Insulation
35mm RPT
Glass unit
up to 52mm
Thermal protection
≥ 0.71 m²·°C/W
Sound insulation
≈45 Rw(dB)
Documentation
Technical specifications
PDF. 304Kb
Invisible elegance
Hidden sash design
The revolutionary Hoja Oculta system conceals the sash behind the frame when viewed from outside. Only a sleek 66mm frame profile is visible, creating an ultra-modern appearance with maximum glass exposure.
Light without limits
Maximum glazing
The minimized frame width means up to 20% more glass area compared to conventional aluminum systems. Flood your interior with natural light while maintaining a clean architectural aesthetic.
Aluminum that insulates
Thermal break technology
The 35mm polyamide thermal break (RPT) provides exceptional insulation for an aluminum system, achieving Uf values down to 1.4 W/m²K - comparable to many PVC profiles.
Built to perform
Structural strength
Aluminum construction provides superior strength-to-weight ratio, enabling larger openings with slimmer profiles. No reinforcement needed, no warping over time.
Endless possibilities
Design freedom
Available in any RAL color with anodized, lacquered, or wood-effect finishes. Different colors inside and out are standard. Perfect for matching any architectural vision.
Built for generations
Durability
Aluminum does not rot, warp, or fade. Marine-grade coatings are available for coastal installations. Minimal maintenance required throughout decades of service.
Cortizo COR 70 Hoja Oculta
A favorite of modern architects. "Hidden Sash" technology means only a thin 66mm frame is visible from outside - maximum glazing, minimalist look.
Calculate Cost
Estimated manufacturing time 3-6 weeks.
Available Services
Free measurement and design More details
Delivery to installation site More details
Installation by our specialists More details
Buy by Phone
Call us Monday to Saturday, except holidays, from 8:00 AM to 10:00 PM. Sundays and holidays from 10:00 AM to 8:00 PM. Call
More Ideas and Inspiration
These are some examples of our work with Cortizo COR 70 Hoja Oculta profile. All this inspiration is for you and only for you.
Financing Options
Enjoy your purchase now and pay for it in installments using our financing services.
More detailsFAQs
Frequently Asked Questions about Cortizo COR 70 Hoja Oculta
What does "Hoja Oculta" mean?
Hoja Oculta means "Hidden Sash" in Spanish. The sash is concealed behind the frame profile when viewed from the exterior, creating a minimalist facade appearance.
How does aluminum compare to PVC thermally?
With a 35mm thermal break, COR 70 achieves Uf ~1.4 W/m²K, comparable to good PVC systems. The key is the quality of the thermal break, not just the material.
Is it more expensive than PVC?
Yes, aluminum systems typically cost 20-40% more than equivalent PVC. However, the premium aesthetics, durability, and design flexibility justify the investment for discerning clients.
What glass thickness is supported?
Up to 52mm, allowing high-performance triple glazing with acoustic interlayers for demanding applications.
Can it be used for very large windows?
Yes, aluminum's strength allows larger sash sizes than PVC. Tilt-and-turn sashes up to 1.5m wide are possible with appropriate hardware.
Is Cortizo a Spanish company?
Yes, Cortizo is headquartered in Galicia, Spain, and is one of the largest aluminum extrusion companies in Europe with over 50 years of experience.